ELI5. Why do most devices requiring AA or AAA batteries need at least two. Why not create a standard battery that is the equivalent of two or have common circuitry that only relies on one battery of a similar low profile?

Question

ELI5. Why do most devices requiring AA or AAA batteries need at least two. Why not create a standard battery that is the equivalent of two or have common circuitry that only relies on one battery of a similar low profile?

In: Engineering

Answer 1

Total Energy output stays about the same even if you adjust voltage. Watt hours is the constant. Watt hours = amps x volts. Therefore You could make a higher voltage battery or a higher amperage battery but without increasing the size of the batter you can’t increase both. Therefore you end up with about 1.5v x 2.0ah.